----- Original Message -----
From: "Tazio Ceri"
To:
Sent: Thursday, August 30, 2001 7:09 PM
Subject: [SLE] Very easy question on ulimit
| ulimit looks just easy to use but...
|
| "-c sets the maximum size of core files created"
|
| what is a core file?
When program crashes it is normal for the operating system to save a copy
of the memory image (core file) to disk for the programmer to look at later
(this is called post-mortem debugging). This sets a maximum size for any
saved core files
| "-l sets the maximum size that may be locked into memory"
|
| What is it?
It is possible to prevent a program being swapped out to disk when it's not
in use. The reason for this is usually that you get a faster response when
you come back to it. If too many programs do this, you could end up with
not enough real memory to run the programs that are locked in memory. (I
don't know, but I suspect Linux will start ignoring the locks if that
happens)
| "-m - the maximum resident set size"
|
| What is it?
This is pretty technical - if you needed it you would know what it meant :)
| "-s the maximum stack size"
| Is this the maximum stack size of a single program, right?
Yes, that's right
| "-t maximum amount of cpu time in seconds"
| In seconds? Seconds in a minute, or what else?
Yes - most programs only use a few tenths of a second over their entire
running time :)
|
| Thanks in advance,
|
| Tazio
|
|
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